2001 AMK s3 temp problem

currently have problems with temperature
car warms up to midway then drops right off down to starting temperature.
The car never over heats.
I have bought a new thermostat ( could do with someone posting a thread for fitting it)
anyone know of anything else that could be causing the problem?

The CTS is easy only takes 5 minutes take the main engine cover off then look down the right of the engine under some pipes you can see a plug into the engine. Remove the plug and there is a clip at the base holding the sensor in make sure you get the old I ring out with it then replace.

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